/***
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2005 INRIA, France Telecom
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the copyright holders nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package clojure.asm.commons;

import clojure.asm.ClassAdapter;
import clojure.asm.ClassVisitor;
import clojure.asm.MethodVisitor;
import clojure.asm.Opcodes;

/**
 * A {@link ClassAdapter} that merges clinit methods into a single one.
 *
 * @author Eric Bruneton
 */
public class StaticInitMerger extends ClassAdapter{

private String name;

private MethodVisitor clinit;

private String prefix;

private int counter;

public StaticInitMerger(final String prefix, final ClassVisitor cv){
	super(cv);
	this.prefix = prefix;
}

public void visit(
		final int version,
		final int access,
		final String name,
		final String signature,
		final String superName,
		final String[] interfaces){
	cv.visit(version, access, name, signature, superName, interfaces);
	this.name = name;
}

public MethodVisitor visitMethod(
		final int access,
		final String name,
		final String desc,
		final String signature,
		final String[] exceptions){
	MethodVisitor mv;
	if(name.equals("<clinit>"))
		{
		int a = Opcodes.ACC_PRIVATE + Opcodes.ACC_STATIC;
		String n = prefix + counter++;
		mv = cv.visitMethod(a, n, desc, signature, exceptions);

		if(clinit == null)
			{
			clinit = cv.visitMethod(a, name, desc, null, null);
			}
		clinit.visitMethodInsn(Opcodes.INVOKESTATIC, this.name, n, desc);
		}
	else
		{
		mv = cv.visitMethod(access, name, desc, signature, exceptions);
		}
	return mv;
}

public void visitEnd(){
	if(clinit != null)
		{
		clinit.visitInsn(Opcodes.RETURN);
		clinit.visitMaxs(0, 0);
		}
	cv.visitEnd();
}
}
